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x in (-oo:+oo)
((9*(2*x+1))/7)*(x-6) = 0
(9*(2*x+1)*(x-6))/7 = 0
( 2*x+1 )
2*x+1 = 0 // - 1
2*x = -1 // : 2
x = -1/2
( x-6 )
x-6 = 0 // + 6
x = 6
x in { -1/2, 6 }
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